A Study of the Flora in Mississippian Rocks of Southwestern Montana
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The Late Mississippian (~330 Ma) was a period of global climate change. During this period southwest Montana was near the equator, and records reveal shoreline deposition along the margin of a foreland basin. The Mississippian plant genera Lepidodendron, Calamites, Lepidophylloides, Cordaites, Lepidophloios, and Trigonocarpus occur in a siltstone unit (Kibbey Formation) near Clark Canyon Reservoir, Montana. Calamites spores were deposited in the Big Sheep Creek section, Montana. Gastropods and bivalves fed on suspended or buried flora also occur with the plant remnants. The results of this study show that Mississippian flora was very primitive and grew in a humid, waterlogged, tropical setting.
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